From: Jiri Kalvoda <jirikalvoda@kam.mff.cuni.cz>
Date: Sun, 26 Feb 2023 19:56:41 +0000 (+0100)
Subject: Add font resize feature
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=0aaf9374adc7af3259e82fb431f4a4d35e6ff281;p=teatimer.git

Add font resize feature

Useful for displaying remaining time on full screen.
---

diff --git a/teatimer.c b/teatimer.c
index 78e72ff..b0e3b5c 100644
--- a/teatimer.c
+++ b/teatimer.c
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <time.h>
 #include <getopt.h>
 
@@ -21,6 +22,9 @@
 static guint second_timer;
 static char old_text[16];
 static GtkWidget *win, *hbox1, *vbox1, *timebox, *namebox, *togglebutton1;
+static PangoFontDescription *timebox_font;
+static bool autoresize_timebox_font = false;
+static int timebox_font_size;
 static time_t alarm_time;
 static char *run_notify;
 static char *default_name = "Tea";
@@ -230,6 +234,44 @@ on_window_remove(GtkContainer *container UNUSED, GtkWidget *widget UNUSED, gpoin
   quit();
 }
 
+static void
+set_timebox_font_size(int new_size)
+{
+  if (new_size == timebox_font_size)
+    return;
+  timebox_font_size = new_size;
+
+  pango_font_description_set_size(timebox_font, timebox_font_size*PANGO_SCALE);
+  gtk_widget_modify_font(timebox, timebox_font);
+}
+
+static void
+on_window_resized(GtkWidget *widget UNUSED, GdkRectangle *rect, gpointer user_data UNUSED)
+{
+  int window_width = rect->width;
+  int window_height = rect->height;
+
+  if (autoresize_timebox_font)
+  {
+    // Binary search for optimal font size
+    int beg = 12, end = 1024;
+    while (beg < end)
+      {
+	int mid = (beg + end) / 2;
+	pango_font_description_set_size(timebox_font, mid*PANGO_SCALE);
+	PangoFontMetrics *metric = pango_context_get_metrics(gtk_widget_get_pango_context(timebox), timebox_font, NULL);
+	int width = pango_font_metrics_get_approximate_digit_width(metric) * 8.3 / PANGO_SCALE;
+	int height = pango_font_metrics_get_height(metric) / PANGO_SCALE;
+	if (width > window_width - 50 || height > window_height - 45)
+	  end = mid;
+	else
+	  beg = mid + 1;
+      }
+
+    set_timebox_font_size(beg);
+  }
+}
+
 static void
 open_window(void)
 {
@@ -254,12 +296,15 @@ open_window(void)
   gtk_widget_show(timebox);
   gtk_box_pack_start(GTK_BOX(vbox1), timebox, TRUE, TRUE, 0);
   gtk_entry_set_text(GTK_ENTRY(timebox), "00:00");
+  timebox_font = pango_font_description_from_string("Monospace");
+  set_timebox_font_size(12);
 
   togglebutton1 = gtk_toggle_button_new_with_label("Run");
   gtk_widget_show(togglebutton1);
   gtk_box_pack_start(GTK_BOX(hbox1), togglebutton1, FALSE, FALSE, 0);
 
   gtk_signal_connect(GTK_OBJECT(win), "remove", GTK_SIGNAL_FUNC(on_window_remove), NULL);
+  gtk_signal_connect(GTK_OBJECT(win), "size-allocate", GTK_SIGNAL_FUNC(on_window_resized), NULL);
   gtk_signal_connect(GTK_OBJECT(namebox), "key_press_event", GTK_SIGNAL_FUNC(on_box_key), NULL);
   gtk_signal_connect(GTK_OBJECT(timebox), "key_press_event", GTK_SIGNAL_FUNC(on_box_key), NULL);
   gtk_signal_connect(GTK_OBJECT(togglebutton1), "toggled", GTK_SIGNAL_FUNC(on_togglebutton1_toggled), NULL);
@@ -274,12 +319,13 @@ open_window(void)
   gtk_widget_show(win);
 }
 
-static const char short_opts[] = "r:n:k:";
+static const char short_opts[] = "r:n:k:a";
 
 static const struct option long_opts[] = {
   { "run",		required_argument,	NULL,	'r' },
   { "kill",		required_argument,	NULL,	'k' },
   { "timer-name",	required_argument,	NULL,	'n' },
+  { "auto-resize",	no_argument,	NULL,	'a' },
   { NULL,		0,			NULL,	0   },
 };
 
@@ -293,6 +339,7 @@ Options:\n\
 \t\t\t\t%%%% will be expanded to %%\n\
 -k, --kill=<int>\tKill run program by a given signal when the timer is stopped\n\
 -n, --timer-name=<str>\tFill name box with <str>\n\
+-a, --auto-resize\tAutomatically resize font to fit the box\n\
 ");
   exit(1);
 }
@@ -328,6 +375,9 @@ main(int argc, char **argv)
       case 'n':
 	default_name = optarg;
 	break;
+      case 'a':
+	autoresize_timebox_font = true;
+	break;
       default:
 	usage();
       }